Engine Tweakers - Help Please - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Paul Clark · 10-23-2002, 10:16 PM

350 (now a 360)
HEI. Aftermarket intake. Edelbrock carb.
If the vacume advance is hooked up, it clicks loudly. Example - when going around corners off the gas.
Have been told that I need a VA that's for a vehicle without EGR.???
I've take the vacume line and plugged it. Everything runs fine, but the MPG really sucks. I should buy stock in my favorite gas station.
New vacume advance?
Vacume lines hooked up to the incorrect side of the carb.?
Vacume mis-spelled.?

Many thanks
Paul

cableguy0 · 10-23-2002, 10:22 PM

first of all egr has nothing to do with vaccum advance.egr is not need however vaccum advance is almost a neccesity.try putting some di electric grease on the advance weights under the rotor in the distributor and hook the vaccum to full manifold vaccum. what kind of intake do u have. if u have an edelbrock there should be a spot right behind the carb that will be plugged off. i have my advance hooked to the left hand vaccum port of my edelbrock 750 carb and have no probs at all.

Paul Clark · 10-23-2002, 10:36 PM

Left side as you are looking at it from the front, or left side as you are sitting in the truck?
Thanks
Paul

bigjimzlll · 10-23-2002, 10:49 PM

first thing..its "vacuum".. lol.. now this clicking, is it detonation? like if you use bad gas? I would get the crane adjustable curve kit..it comes with an adjustable vacuum canister and a limit plate along with some springs and pretty good instructions...install the limit dohickey...and put it in the middle of its movement..this will be about 12 degrees limit..set timing at 10 degrees BTDC...hook up the vacuum line to full manifold vacuum...check timing..it should be around 22 degrees rev motor to 3000 rpm and hold for a few seconds ..check timing you should have 34-36 degrees total in at 3000... if it comes in later than that...use the springs to adjust accordingly...this is a good base line time...every engines a little different..mine likes 14 deg. initial..all in by 2700 rpm...good luck

Paul Clark · 10-23-2002, 10:54 PM

Many thanks. I'll check.
It's not detonation. It's a mechanical clicking.
Maybe I'll just turn up the radio.

No matter how I have it hooked up, though, the VA should have some effect on MPG, right?
Thanks again.
Paul

10-23-2002, 10:16 PM	#1
Paul Clark Registered User Join Date: Apr 2002 Location: Center Point, IA Posts: 502	Engine Tweakers - Help Please 350 (now a 360) HEI. Aftermarket intake. Edelbrock carb. If the vacume advance is hooked up, it clicks loudly. Example - when going around corners off the gas. Have been told that I need a VA that's for a vehicle without EGR.??? I've take the vacume line and plugged it. Everything runs fine, but the MPG really sucks. I should buy stock in my favorite gas station. New vacume advance? Vacume lines hooked up to the incorrect side of the carb.? Vacume mis-spelled.? Many thanks Paul

10-23-2002, 10:22 PM	#2
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	first of all egr has nothing to do with vaccum advance.egr is not need however vaccum advance is almost a neccesity.try putting some di electric grease on the advance weights under the rotor in the distributor and hook the vaccum to full manifold vaccum. what kind of intake do u have. if u have an edelbrock there should be a spot right behind the carb that will be plugged off. i have my advance hooked to the left hand vaccum port of my edelbrock 750 carb and have no probs at all. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

10-23-2002, 10:49 PM	#4
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	first thing..its "vacuum".. lol.. now this clicking, is it detonation? like if you use bad gas? I would get the crane adjustable curve kit..it comes with an adjustable vacuum canister and a limit plate along with some springs and pretty good instructions...install the limit dohickey...and put it in the middle of its movement..this will be about 12 degrees limit..set timing at 10 degrees BTDC...hook up the vacuum line to full manifold vacuum...check timing..it should be around 22 degrees rev motor to 3000 rpm and hold for a few seconds ..check timing you should have 34-36 degrees total in at 3000... if it comes in later than that...use the springs to adjust accordingly...this is a good base line time...every engines a little different..mine likes 14 deg. initial..all in by 2700 rpm...good luck __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

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10-23-2002, 10:36 PM	#3
Paul Clark Registered User Join Date: Apr 2002 Location: Center Point, IA Posts: 502	Left side as you are looking at it from the front, or left side as you are sitting in the truck? Thanks Paul

10-23-2002, 10:54 PM	#5
Paul Clark Registered User Join Date: Apr 2002 Location: Center Point, IA Posts: 502	Many thanks. I'll check. It's not detonation. It's a mechanical clicking. Maybe I'll just turn up the radio. No matter how I have it hooked up, though, the VA should have some effect on MPG, right? Thanks again. Paul



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